Utilization of Steel Slag as Aggregates for OGFC-13

Abstract

We propose a new method to make OGFC-13. By this method we select steel slag as coarse aggregate (whose diameter is bigger than 4.75mm) and limestone as fine aggregate, using the SBS modified asphalt to make OGFC-16. The Mix Proportion is 1#(19-13.2mm,steel slag):2#(13.2-9.5mm, steel slag):3#(9.5-4.75mm, steel slag):4#(4.75-0mm, limestone):mineral powder=13%:28%:45%:13%:1%. The optimal asphalt content (OAC) is 4.5%, the polyester fiber content is 0.3%, and the steel slag content reaches 86%. The increase of the amount of asphalt and polyester fiber doesn’t help to save costs. When the asphalt content is optimum, the run-off loss and Cantabro scattering loss satisfy the Chinese regulatory requirements. By Marshall Stability test, we find that the Marshall stability of OGFC-13 reaches 9.8kN, superior to China's traffic regulations. The water permeability coefficient of OGFC-13 is 37.0, which means that OGFC-13 has a strong water seepage performance. In a word, OGFC-13 made by our method can guarantee the driving security of the long-term use of the road and save a lot of road maintenance costs.